oral vs spoken

oral is a noun but spoken is not a noun.

Word	Noun	Adjective	Verb	Adverb
oral	Yes	Yes	No	No
spoken	No	Yes	No	No

oral (noun)	spoken (noun)
an examination conducted by spoken communication

oral (adjective)	spoken (adjective)
of or involving the mouth or mouth region or the surface on which the mouth is located	uttered through the medium of speech or characterized by speech; sometimes used in combination
a stage in psychosexual development when the child's interest is concentrated in the mouth; fixation at this stage is said to result in dependence, selfishness, and aggression
of or relating to or affecting or for use in the mouth
using speech rather than writing